还有另外两种研究对印第安人的起源提供了一些线索;它们包括对牙齿和语言的研究。
There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages.
还有另外两种研究对印第安人的起源提供了一些线索;它们包括对牙齿和语言的研究。
There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages.
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